Thomas e



(No Model.)

I T. E. MART-IN. BURGLAR ALARM ATTACHMENT FOR WINDOWS.

No. 413,951. Y Patented Oct, 29, 1889.

v i: UNITE STATES PATENT O F-ICE.

"THOMAS E. MARTIN, DES MOINES, IOWA, ASSIGNOR OF ONE-HALF TO GEORGE C. BOGGS, OF SAME PLACE.

BURGLAR-ALARM ATTACHMENT FOR wmoows.

SPECIFICATION forming part of Letters Iatent No. 413,951, dated October 29, 1889. 7

Application filed Mm 29, 1889.

Too/ll whom it may concern..-

. as hereinafter set forth, pointed out in my claims, and illustrated in the. accompanying drawings, in which Figure l is a side elevation, with part broken away, of my complete device ready to be applied. Fig. 2 shows sections of two window-sashes and my device attached as required for practical operation. Fig. 3 is an end view of the base or frame having the bell, the striker, and the lever combined therewith.

- a is a fiat perforated base adapted to be fixed upon the top of a sash by means of common screws.

b is a post or roller-bearer that projects perpendicularly from one edge of the base a.

o is a corresponding bearer on the opposite edge of the plate;

d is a curved post pivoted to the base a to support a bell.

f is a roller placed upon an axle g, fixed 'to the parallel bearers b and c.

f is an elastic ring fixed over the periphery of the roller. v

his a circular flange on the side face of the roller, and 1 2 3 4 are-catches at the ends of inclined planes in the side face or edge of the m is a striker connectedtwith the fixed axle-bearer b by means of a coiled spring wire n in such a manner that the springwire will in its normal condition retain the striker close to but not in contact with the inside of the bell.

ris a bell fixed to the top of the bearer d in such a manner that it will practically cover the roller and base.

Serial No. 305,280. (No model.)

7 sis an elbow-shaped lever pivoted on top of the base a in such a manner that its vertical portion can be adjusted relative to the spring-stem n of the striker and the catches 1 2 3 4.- on the side of the roller.

In the practical operation of my invention when applied to a window, the raising of the lower sash or the lowering of the upper sash will, by the contact and friction of the upper sash with the periphery of the roller,'rotate the roller in such a manner that the catches 6o 1 2 3 4. will successively engage and lift the spring and striker, and the vertical portion of the lever s will perform the function of a cam and throw the spring n off the catches and free the force stored in the elevated spring to be exerted in" beating the striker upon the {bell as required to ringit and sound an alarm.

To make the striker inoperative I move the lever so that its vertical portion will press against the spring at sufiiciently to hold it away from the roller, as required, to allow the roller to rotate without catching and lifting the spring and striker.

I am aware that a roller having a ratchet on its side face has been combined with a bell and a base adapted to be fixed to a window-sash by means of a hinged post and ahinged rollerbearer; but my manner of constructing a a lever, and a spring therewith is novel and greatlyadvantageous, in that it can be readily applied and made operative or inoperative at pleasure. By turning the lever so as to project at right angles to the bell it will press the spring-stem of the hammer and remain stationary, as required, to retain the hammer inoperative while one of the Windows is moved and the roller rotated, or by simply pressing against the outer end of the lever with a finger while raising or lowering a sash the striker will be retained inoperative until the pressure of the finger is relaxed. Windows can be thus moved up ordown by a person on the inside without sounding the bell or giving an alarm.

I claim as my invention- 1. A burglar-alarm and window attachment comprising a base 01., having posts I) and frame-and combining a roller, a bell, a striker;

0 at its sides, a roller having a series of catches 1 2 3 4 in bearings at the tops of said posts, a curved post d between said posts, a bell fixed to the curved post, a striker in, having a spring-stein n fixed to one of the side posts, and a lever s, pivoted on top of the base, constructed and combined to operate in the manner set forth.

2. The base a, having fixed posts I) and c at its sides, the roller f, having a series of catches on its side face in bearings at the tops of said posts, a curved post (Z between structed and combined and attached to the top of a window-sash to operate in the manner set forth, for the purposes stated.

THOMAS E. MARTIN.

Witnesses:

R. H. ORWIG, THOMAS G. ORWIG. 

